I don't travel that much so I do not want that many saltwater rods. But I very occasionally go to places like ontario canada florida keys and various locations in alaska. So I am looking for a rod that can handle large king salmon, pike, musky, tarpon, permit, small dorado/yellowfin. I think a 9 ft 10 wt with a nice saltwater reel and tropical fly line could potentionally handle these but I am not sure. I have only caught these species on conventional tackle, except for the salmon. Right now I have a ton of freshwater rods all the way up to an 8 wt, which has been my only saltwater outfit. I live right next to the coast in southern california with a nice 30 ft boat so I figure I better be more prepared for some saltwater fly opportunities that may arise as well.

A 10 wt. is plenty for everything on your list but maybe the yellowfin and some of the bigger Dorado. A good reel you can pack a pile of backing on is really important. You can whip smaller Yellowfin and Dorado with a 10 wt. and if you have a good capt. running the boat and a the reel to back you up, you can get a pretty big one too. I caught Yellowfin when I was stationed in Pearl Harbor that just weren't fly rod material. They pull like a freight train. A real big Yellowfin is not going to be a cake walk on a 12 either. Given all the things you want to do, get the 10, forget the 12. A 12 would be a waste for what you want and you will just end up getting the 10 anyway.